Composite double base propellant with {62 -diketone stabilizer

ABSTRACT

WHEREIN R2 and R3 are alkyl having one to 10 carbon atoms, haloalkyl having one to 10 carbon atoms or aryl radical.   Propellant composition having an excellent stability at a high temperature is a composite modified double base propellant containing an oxidizing agent and a diketone having the general formula

United States Patent Inoue et al.

1 Feb. 19, 1974 COMPOSITE DOUBLE BASE PROPELLANT WITH B-DIKETONE STABILIZER lnventors: Kazuhiro lnoue, Chita-gun;

Kazutoshl Kilo, Nagoya; Fumio Matsui, Chita-gun, all of Japan Nippon Oils and Fats Company Limited, Tokyo, Japan Filed: Dec. 21, 1972 Appl. No.: 317,122

Assignee:

Foreign Application Priority Data Field of Search..... 149/38, 98, 100, 50, 65, 76, 149/79, 18, 19, 20

References Cited UNITED STATES PATENTS 1/1973 Pierce 149/38 X 3,245,849 4/1966 Klager et al. .1 149/19 2,982,638 5/1961 Cooley et a1 1 149/98 3,228,815 1/1966 Henry et al. 149/98 3,689,331 9/1972 Pierce 149/98 X Primary ExaminerCarl D. Quarforth Assistant Examiner-E. A. Miller Attorney, Agent, or Firm-Stevens, Davis, Miller & Mosher [57] ABSTRACT Propellant composition having an excellent stability at a high temperature is a composite modified double base propellant containing an oxidizing agent and a diketone having the general formula wherein R and R are alkyl having one to 10 carbon atoms, haloalkyl having one to 10 carbon atoms or aryl radical.

3 Claims, No Drawings B-DIKETONE STABILIZER compounds having the following formula are effective.

The present invention relates to a composite modified double base propellant composition having a high stability at a high temperature.

The present invention can provide a propellant comln the above formula, R and R are alkyl having one to carbon atoms, haloalkyl having one to l0 carbon atoms or aryl radicals.

These compounds have been always used together osition vi xtr m l p ha ng e e y h'gher at a high with an lsocyanate compound as an additive for protemperature of 60 C than a conventional propellant longing the pot life of the polyurethane propellant. composition, which is obtained by addmg an fi-dike- However, the present invention has no relation to tone compound in the production of composite mod| fled double base to "am (abbr l d CMDB such an activity and it has been found that the foaming p pe e as can be prevented by using the above described B-dikepropellant hereinafter).

tone alone.

In general, CMDB propellant contains nitric acid es- The amount to be added varies in ammonium perters, such as nitroglycerine, nitrocellulose and the like chlorate series CMDB propellant and a i i. and n xi g g n h as mm nium, pota iu trate series CMDB propellant respectively but 0.5 to 2 or lithium perchlorate or ammonium, potassium or lithpercent by weight is preferable. ium nitrate and therefore a small amount of water in Namely, when the water content in the propellant is the propellant dissolves the oxidizing agent and further about 0.3 percent, if the amount is less than 0.5 perpromotes the decomposition of the nitric acid ester. cent, the foaming probably occurs and when the This phenomenon is slow at room temperature but amount is more than 2 percent, it is not practicable in when the temperature is raised as an acceleration test view of physical properties and property of combusfor storage for a long period of time, the reaction may tion. However, the amount is not particularly limited. proceed rapidly to cause a foaming phenomenon. Such The following examples are given for the purpose of a propellant causes an abnormal combustion upon the illustration of this invention and are not intended as combustion, which is a great demerit as the propellant. limitations thereof.

EXAMPLES Comparative Component Example sample 1 2 3 4 5 6 7 8 9 to Nitrocellulose... 20 2O 20 20 20 20 2O 20 20 20 20 2O Nitroglycerine.. 37 37 37 37 37 17 37 "i7 37 17 37 .17 Plasticizer. 9 9 9 9 Q 9 9 9 9 9 9 9 Aluminum l6 l6 l6 l6 l6 In If l6 l6 l6 I6 16 Ammonium perchlorate. l8 0 1B 0 18 ll 0 l8 l8 l8 l8 lil Ammonium nitrate 0 l8 0 l3 0 l8 0 0 0 0 O 0 Potassium perchlorate O 0 0 0 0 0 l8 0 0 0 0 0 Composition Acetylacetone 0 0 1 0 0 0 0 0 0 0 0 0 Benzoylacelone 0 O 0 2 0 l l 0 0 0 0 0 Prgpignylacetone. 0 0 0 0 1.5 0 0 0 0 0 0 0 o-Hydroxybenzoylpropionylmethan 0 O 0 0 0 0 0 I 0 0 0 0 Benzoyl-n-butyroylmethane 0 l) 0 (l 0 0 0 0 l 0 0 0 Propionylisovalerylmethane. 0 D 0 (l 0 0 0 0 0 l 0 0 C hlorobenzoylacetoylmethane 0 0 0 0 O 0 0 0 0 0 l O Benzo yldichloroaceto ylmethane 0 0 0 0 0 0 0 0 0 0 0 l 6 x x o o o o o o o o o 12 X x o o o o o o o o 0 I8 x x o o o o o o o o o 24 x x o o o o o o o o 0 X-ray test Lapseot'days x x o o o o o o o o o 36 x x o o o o o 0 o o o 42 x x o o o o o o o o o 48 x x o o o o o o o o o 54 x x o o o o o o o o 0 In X-ray lest. the formation of foam in propellant was determined.

it: Foam is formed. 0: No foam.

X 100! ofhard vinyl chloritk pipe was used and the upper and lower ends were sealed by a rubber.

Test temperature: 60C.

The amount of the diketone added in the above Table shows the part by weight based on 100 parts of the composite modified double base propellant containing an oxidizing agent.

in order to solve such an inconvenience, it is necessary to restrain the foaming and the inventors have studied concerning the foaming and found that B-diketone What is claimed is: l. A propellant composition having excellent high temperature stability comprising a composite modified double base propellant consisting essentially of nitrocellulose, nitroglycerine and an oxidizing agent, having added thereto diketone of the general formula wherein R and R are alkyl having one to l carbon atoms, haloalkyl having one to H) carbon atoms or aryl radicals.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3.793.093 Dated Fghguag! 1,9, 1974 Inventofls) imj INQHE t 1 I It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

IN THE TABLE, himerals 6 54 should be included in the column of "Lapse of days" and "x" mark and "0" mark should be shifted to succeeding left columns respectively as shown in red b y'jithe attached Table.

V Signed and sealed this 4th day "of February 1975.

(SEAL) Attest:

McCOY GIBSON JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents UNITED PATEN'l OFFICE CERTIFICATE OF CORRECTION Patent No. 357934193 Dated Fghmar! lg 1974 Inventor s) K; m j INQHE g]; a].

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

IN THE TABLE, numerals 6 54 should be included in the column of "Lapse of days" and "'x" mark and "0" mark should be shifted to succeeding left columns respectively as shown in red by the attached Table.

V Signed and sealed this 6th day of February 1975.

(SEAL) Attesta McCOY M, mason JR. 0. MARSHALL DANN Attesting Officer Commissioner of Patents UNITED STATES PA'IENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 793 9& Dated Eghnaggx l2, 1974 Inventofls) Kaznhjrg INQHE g]; 51

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

IN THE TABLE, numerals 6 54 should be included in the column of "Lapse of days" and "x" mark and "0" mark should be shifted to succeeding left columns respectively as shown in red by the attached Table.

Signed and sealed this 4th day of February 1975.

(SEAL) Attest:

McCOY M. Attesting Officer GIBSON JR. C. MARSHALL DANN Commissioner of Patents 

2. Propellant as claimed in claim 1, wherein said diketone is selected from the group consisting of acetylacetone, benzoylacetone, propionylacetone, o-hydrobenzoylpropionylmethane, benzoyl-n-butyroylmethane, propionylisovalerylmethane, chlorobenzoylacetoylmethane and benzoyldichloroacetoylmethane.
 3. Propellant as claimed in claim 1, wherein said oxidizing agent is selected from the group consisting of perchlorates and nitrates. 